/var/log/proftpd/proftpd.log 
/var/log/proftpd/controls.log 
{
	weekly
	missingok
	rotate 7
	compress
	delaycompress
	notifempty
	create 640 root adm
	sharedscripts
	postrotate
		# reload could be not sufficient for all logs, a restart is safer
		invoke-rc.d proftpd restart 2>/dev/null >/dev/null || true
	endscript
}

/var/log/proftpd/xferlog
/var/log/proftpd/xferreport
{
	monthly
	missingok
	rotate 7
	compress
	delaycompress
	notifempty
	create 640 root adm
	sharedscripts
	prerotate
	endscript
	postrotate
		# reload could be not sufficient for all logs, a restart is safer
		invoke-rc.d proftpd restart 2>/dev/null >/dev/null || true
		# run ftpstats on past transfer log
		ftpstats -a -r -l 2 -d -h -f /var/log/proftpd/xferlog.0 2>/dev/null >/var/log/proftpd/xferreport || true
	endscript
}